在模拟海水中接种了硫酸盐还原菌(SRB)，测得其生长曲线以及该模拟海水pH和溶解氧浓度随时间的变化曲线；在接种及未接种SRB模拟海水中采用三电极体系测得X70钢的开路电位、极化曲线和电化学阻抗谱，分析了SRB不同生长阶段对其腐蚀行为的影响.结果表明：SRB的生长经历了数量呈指数增长时期(0~5d)，数量达到最大的稳定生长期(6~10d)和数量减少的衰亡期(11~14d)三个阶段；接种SRB模拟海水的pH稳定在6．19~7．18之间，溶解氧浓度随时间的延长呈下降趋势；在接种SRB模拟海水中，随着SRB数量的增多， X70钢的自腐蚀电流密度逐渐增加；在接种SRB模拟海水中试样的表面点蚀坑较为明显，且随时间的延长点蚀坑直径有所增大.
Sulfate reducing bacteria (SRB)were added in simulated sea water,and then the growth curve of SRB,the pH value and dissolved oxygen concentration of the simulated sea water were measured;the open circuit potential,polarization curve and electrochemical impedance spectrum of X70 steel in the simulated sea water with and without SRB were obtained by three-electrode system,and the influence of SRB growth process on the corrosion behavior of X70 steel was also analyzed.The results show that the growth of SRB went through three stages of exponential growth period (0-5 d)with the exponential increase of SRB amount,stable growth period (6-10 d) with the largest SRB amount and decline period (11-14 d)with the decrease of SRB amount.The pH value of the simulated sea water with SRB was between 6.19 and 7.18 and the dissolved oxygen concentration decreased with the extension of time.In the simulated sea water with SRB,the free corrosion current density of X70 steel increased gradually with the SRB amount increasing.The corrosion pits were more obvious on the sample surface in the simulated sea water with SRB and the diameter of corrosion pit increased with the increase of time.
参考文献
| [1] | 刘大扬;魏开金;李文军;曹付炎.南海榆林海域环境因素对钢局部腐蚀的影响[J].中国腐蚀与防护学报,2003(4):211-216. |
| [2] | Hamilton W.A..Bioenergetics of sulphate-reducing bacteria in relation to their environmental impact[J].Biodegradation,19983/4(3/4):201-212. |
| [3] | 匡飞;王佳;张盾;李永娟;万逸;刘怀群.硫酸盐还原菌的生长过程及其对D36钢海水腐蚀行为的影响[J].材料开发与应用,2008(3):49-52. |
| [4] | 李付绍 .硫酸盐还原菌生物膜下钢铁材料腐蚀行为的研究[D].哈尔滨工业大学,2009. |
| [5] | 刘玉秀;刘贵昌;战广深;牛永强.硫酸盐还原菌对A3钢电化学腐蚀行为的影响[J].腐蚀科学与防护技术,2003(3):141-143. |
| [6] | 陈凯;晏利君;刘宇;范玉然;冯斌;易诚;张明旭;杨眉.X70大变形管线钢管的组织和性能[J].机械工程材料,2013(9):21-24,78. |
| [7] | 张备;杨剑峰;王波.南海荔湾X70和X65大壁厚海洋管线的开发与应用研究[J].焊管,2013(9):30-37. |
| [8] | 李相波;王伟;王佳;刘五一.海水中微生物膜的生长对金属腐蚀过程的影响[J].腐蚀科学与防护技术,2002(4):218-222. |
| [9] | 林晶;阎永贵;陈光章;刘光州;李庆芬.生物膜和腐蚀产物膜对A3钢的腐蚀作用研究[J].电化学,2006(1):93-97. |
| [10] | Belkaid, S.;Ladjouzi, M.A.;Hamdani, S..Effect of biofilm on naval steel corrosion in natural seawater[J].Journal of solid state electrochemistry,20113(3):525-537. |
| [11] | 朱永艳 .硫酸盐还原菌和极化电位对海洋结构用钢在海泥中的应力腐蚀开裂敏感性的影响[D].中国科学院海洋研究所,2007. |
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